Dr. Joungho Park and his team from KIER's Energy AI and Computational Science Lab conducted a detailed economic analysis of alkaline and PEM water electrolysis for green hydrogen production. Green hydrogen, a crucial eco-friendly fuel, is expected to play a significant role in future energy landscapes. The research highlighted the challenges and opportunities of both technologies, emphasizing the need for cost-effective strategies to enhance efficiency and reduce production costs. The study proposed optimal operation strategies, including utilizing the existing power grid as a supplemental power source for alkaline water electrolysis systems. It also discussed the benefits of integrating renewable energy sources and energy storage systems to ensure stable power supply and maximize hydrogen production efficiency. By evaluating different scenarios and cost calculations, the research team demonstrated how combining various technologies could lead to both economic and environmental sustainability in hydrogen production. The analysis also delved into the potential of PEM water electrolysis, suggesting that overloading the system could improve economic efficiency by increasing hydrogen production. For regions with high renewable energy availability, PEM systems were deemed most suitable, while a combination of alkaline water electrolysis and carbon-free power grids was recommended in other cases. The study further proposed a tailored hydrogen production combination for Korea, utilizing water electrolysis systems combined with offshore wind and solar power. The aim is to achieve a stable hydrogen supply at an affordable cost, showcasing the potential for greener energy transition in the country. Dr. Joungho Park emphasized the importance of the research in guiding future technology selection and investment decisions for sustainable hydrogen production using renewable energy sources.